BS EN ISO 12958-2-2020 PDF

Full title and description

STB BS EN ISO 12958-2:2020 — Geotextiles and geotextile-related products — Determination of water flow capacity in their plane — Part 2: Performance test. This is the British (BS EN) adoption of the ISO 12958-2:2020 international standard describing a performance test method to determine in-plane water flow capacity of geotextiles and related products under representative boundary and loading conditions.

Abstract

This document specifies a constant-head, in-plane water flow performance test for geotextiles and geotextile-related products. The method uses representative boundary materials and a series of standard test conditions (including soil confinement, low hydraulic gradients, pre‑seating times and a set of normal loads) to determine the water flow capacity within the plane of the product under conditions of practical interest.

General information

• Status: Published / Current (adopted as a BS EN ISO document).
• Publication date: October 2020 (ISO publication) — BS adoption published November 10, 2020.
• Publisher: International Organization for Standardization (ISO); adopted and published for the UK by the British Standards Institution (BSI) as BS EN ISO 12958-2:2020.
• ICS / categories: 59.080.70 (Geotextiles).
• Edition / version: Edition 1 (2020).
• Number of pages: ISO edition: 16 pages; BS EN ISO published/adopted edition typically formatted as 24 pages (national adoption copies can differ in pagination).

Scope

The standard defines a laboratory procedure to measure the constant-head in‑plane water flow capacity of geotextiles and geotextile-related products under performance test conditions that simulate field boundary materials and loading. It provides a standard series of test conditions (confinement, hydraulic gradient, seating time, and normal loads) so that comparative performance data can be generated for design, specification and quality control.

Key topics and requirements

• Definition of the in‑plane constant‑head test apparatus and specimen preparation.
• Use of representative boundary materials (soils or other contact materials) to simulate field confinement effects.
• Specification of hydraulic gradients (low gradients) and constant-head conditions for testing.
• Pre‑seating (conditioning) times and procedures to achieve realistic contact between test specimen and boundary materials.
• Range of normal loads to be applied during measurement to reflect practical stresses.
• Calculation and reporting of in‑plane water flow capacity (flow rate per unit width or area under specified conditions).
• Requirements for repeatability, test reporting and interpretation of results for comparative and design purposes.

Typical use and users

Used by geotextile manufacturers (product development and quality control), independent testing laboratories, consulting and design geotechnical/civil engineers, specifiers and procurement teams involved in drainage, filtration and separation applications. It supports material selection, design verification and performance comparison for drainage layers, filters and systems where in‑plane flow capacity is critical.

Related standards

ISO 12958-1:2020 — Geotextiles and geotextile-related products — Determination of water flow capacity in their plane — Part 1: Index test (index/test for factory-made products). The 2020 two-part suite (Parts 1 and 2) replaces the earlier ISO 12958:2010. National/adopted variants (EN ISO / BS EN ISO) correspond to the international parts. Related geotextile standards for applications and properties include various EN and ISO documents covering geotextile characteristics for roads, pavements and drainage.

Keywords

geotextiles; in-plane flow; water flow capacity; constant-head test; performance test; index test (Part 1); soil confinement; hydraulic gradient; drainage; filtration; test method; ISO 12958.

FAQ

Q: What is this standard?

A: It is ISO 12958-2:2020 (adopted as BS EN ISO 12958-2:2020) — a laboratory performance test method to determine the in‑plane water flow capacity of geotextiles and geotextile-related products under representative boundary conditions.

Q: What does it cover?

A: It covers a constant-head in‑plane water flow performance test, specifying apparatus, specimen preparation, boundary materials, hydraulic conditions, seating times, applied normal loads, calculation of flow capacity and reporting requirements to enable meaningful performance comparisons.

Q: Who typically uses it?

A: Manufacturers, independent test laboratories, design and consulting geotechnical/civil engineers, specifiers and procurers who need comparative or design-level information on the in‑plane drainage performance of geotextiles.

Q: Is it current or superseded?

A: The 2020 Part 2 document is the current published performance-test method and together with ISO 12958-1:2020 replaces the earlier ISO 12958:2010. Users should check national standards bodies for any subsequent revisions or confirmations beyond 2020.

Q: Is it part of a series?

A: Yes — it is Part 2 of a two-part 2020 series (ISO 12958-1:2020 is Part 1, the index test). The two parts provide an index test (Part 1) and a performance test (Part 2) for in‑plane water flow capacity.

Q: What are the key keywords?

A: Geotextiles; in‑plane flow; water flow capacity; constant‑head; performance test; soil confinement; hydraulic gradient; ISO 12958-2; BS EN ISO.